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B-Meters IWM-MB4 Wired M-BUS module WDE-K50

The IWM-MB4 is an integrated module that can be used with the Woltmann WDE-K50 line of water meters to transmit consumption data over a cable M-BUS network.

It is simple to install and set, and in addition to providing data on current consumption, it enables the detection of potential water leaks downstream of the meter, prolonged operation at maximum flow rate (Q4), and many sorts of attempted meter fraud.

The application is immune to the vibrations of the pipes thanks to the employment of an inductive target in the meter dial, which also eliminates the potential of magnetic fraud.

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  • Features
  • Technical Features
  • Analysis of consumption with adjustment for reverse flow.
  • Fraud detection (module removal, manipulation with the external magnetic field, reverse flow, and water leakage).
  • Every alarm is noted and reported in the M-BUS telegram the module sends.
  • Installation of the module is possible even in tough settings thanks to IP68 protection*.
  • A straightforward smartphone app can be used to configure and commission a device having NFC interface.


MBUS EN13757-2\3

Cable length

1.5 meters

Compatible water meters


Sensitivity measure

10 liters (up to DN125) or 100 liters (from DN150)

Reverse flow

Activate for the backward flow amount after user-settable threshold

Energy supply

Non-replaceable lithium battery, rechargeable (automatic recharge from the BUS network).

Backup for measuring function in absence of BUS voltage

Protection class



151 g

Size (l x p x h)

100 x 100 x 25 mm

Working Temperature

+1° / +55°C

Transmitted data

Volume (consumption), alarms


Discharged battery, module removal, magnetic fraud attempt, backward flow, leakage detection

Module programming requirements

Android device (smartphone, tablet, etc.) with an NFC interface and the NFC IWM Config APP freely downloadable from GOOGLE PLAY

Any M-BUS level converter and Windows PC with B M-BUS software installed

(or other M-BUS softwares**).

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